What is angle A equal to? Round your answer to the nearest hundredth. I have no idea what to do :( Helppppp please!!!!!

Answer:
100 (rounded to nearest hundred)
Step-by-step explanation:
Angle B = cos-1 (A/H)
= cos-1 (6/7)
= 31
Angle A = 180 - (90(right angle) + 31)
= 59